Pipe-joint.



' Patented Apr. 24, I900. A. BRANDT.

PIPE JOINT (Application filed Aug. 26, 1899;

2 Shqets-Shept I.

(No Modal.)

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WITNESSES "4: norms PETER; co, Mum wummou, 0.1;.

No. 648,232. Patented Apr. 24, I900. A. BRANDT.

PIPE JOINT.

(Application filed Aug. 25, 1899.)

2 Sheets-Sheet 2 (No Model.)

WlTNESSES m: nomu s inns 0a.. rumo-Lrma. wumuaron n c NITED STATESALFRED BRANDT, OF HAMBURG, GERMANY.

PIPE-JOINT.

SPECIFICATION forming part of Letters Patent N 0. 648,232, dated April24:, 1900.

Application filed August 25, 1899. SerialNo. 728,485. (No model.)

To all whom it may concern:

Be it known that I, ALFRED BRANDT, a subj ect of the German Emperor,residing at Hamburg, Germany, have invented certain new and usefulImprovements in Pipe-Joints; and I do hereby declare the following to bea full, clear, and exact description of the invention, such aswillenable others skilled in the art to which it appertains to make anduse the same.

My invention has reference to pipe-joints, more especially such as areintended for the conveyance of fluids under high pressures; and theobject of my invention is to so con- I 5 struct the joint that aperfectly-tight closure will be elfected bya metal-to-metaljoint, and,further, that the said joint will be protected from injury by the fluidcontents of the pipe.

n the accompanying drawings, Figure l is a longitudinal section of apipe-joint constructed in accordance with .my invention. Fig. 2 is atransverse section on the line 2 2, Fig. 1; and Fig. 3 is a longitudinalsection, on a larger scale, through a part of the pipe- 2 5 joint.

The metal-to-metal joint may be formed in the metal of the pipe itselforin flanges forming part of the metal pipe; but I prefer to provide theadjacent ends a a of the pipes 0 with collars Z) and c, which may bescrewed, welded, or otherwise suitably secured to the ends of the pipes.One of these collars-for instance, the collar h, which may beconveniently made of bronze-is provided with an annular groove cl with abearing or packing face f, preferably inclined, as shown more clearly inFig. 3. Into this annular groove d fits an annular projection g on thecollar 0, which may be conveniently made of steel.

This annular projection has on its outer edge an inclined bearing-faceh, which fits into and bears against the corresponding face f of thecollar 1) when the pipes are joined together. The annular projection gis also provided with an annular recess 1', which will lie opposite thecorresponding recess in the bottom of the groove cl, these two recessesforming between them an annular channel for the reception of asoftpackingZ,of rubber or other suitable material, which will thus liebetween the described metal-to-metal joint and the interior of the pipeto protect the said joint from corrosion or other injury by the fluidcontents of the pipe. The inner edge in of the annular projection g ispreferably made to project less than does the outer edge h, so that whenthe parts are fitted together the liquid contents of the pipe can get tothe packing-ring Z and, exerting lateral pressure upon it, expand thesaid packing-ring and prevent the'contents of the pipe from getting atthe metal surfaces f it.

Any suitable means may be provided for drawing the two ends of the pipestogether to make the joint tight-as, for instance, the ordinary flanges,bolts, and nuts; but I prefer to use the hollow nut Zcshown in thedrawings. This nut has an inner shoulder It at one end to bear againstone of the collars c,

and at its opposite end it has an internal thread to engage with anexternal thread 011 the collar 5, so that by turning the nut the pipeends may be drawn together to bring the two surfacesf'h tightly againsteach other. The end of the collar b maybe provided with suitable lugs bfor the application of the tool to screw the collar onto the end of thepipe or to hold it against the screwing or unscrewing movement of thenut 7t. As, however, the metal packing described needs but very slightpressure to make the joint tight, but little force is necessary tocomplete the joint.

I should add that by the term metal-ta metal joint, I mean a fluid-tightjoint formed by contact, under suitable pressure, of two abutting metalfaces, and in my device such a joint is shown, as before indicated,atfh, which joint is protected from the action of the fluid in the pipeby means of the soft packing interposed between the said joint and theinterior of the pipe.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is-

1. A pipe-coupling comprising a pipe end having a projecting annularedge, with another pipe end having an annular groove to form ametal-to-metal joint by the abutting metallic ends of the coupling, incombination with a packing of elastic material, interposed between saidjoint and the interior of the pipe, as and for the purpose defined.

2. A pipe-coupling consisting of a pipe end having a collar securedthereto, the said col- IOO lar having a groove with inclinedbearingfaces, in combination with another pipe end having an annularprojection with an inclined bearing edge to fit that in the groove ofthe other pipe, forming a metal-to-inetal joint, recesses in theadjacent parts of the collars and a packlng of elastic material locatedin said recesses andinterposed between the said bearing-faces and theinterior of the pipe, substantially as described.

In testimony whereof I affix my signature in presence of two Witnesses.

- ALFRED BRANDT. In presence of--- L. SooKELsooE ZOE, A. VILLA.

